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  • Question
  • Segregation is responsible for


  • Options
  • A. honey-combed concrete
  • B. porous layers in concrete
  • C. surface scaling in concrete
  • D. sand streaks in concrete
  • E. all the above.

  • Correct Answer
  • all the above. 


  • Concrete Technology problems


    Search Results


    • 1. The grade of concrete not recommended by I.S. : 456, is

    • Options
    • A. M 100
    • B. M 200
    • C. M 300
    • D. M 400
    • E. M 500
    • Discuss
    • 2. For construction of structures in sea water, the cement generally preferred to, is

    • Options
    • A. Portland-pozzolana cement
    • B. quick setting cement
    • C. low heat Portland cement
    • D. rapid hardening cement
    • E. none of these.
    • Discuss
    • 3. Addition of pozzolana to cement

    • Options
    • A. decreases workability
    • B. increases strength
    • C. increases heat of hydration
    • D. decreases curing time
    • E. none of these.
    • Discuss
    • 4. Specified compressive strengh of concrete is obtained from cube tests at the end of

    • Options
    • A. 3 days
    • B. 7 days
    • C. 14 days
    • D. 21 days
    • E. 28 days.
    • Discuss
    • 5. For compacting plain concrete road surface of thickness less than 20 cm, we use

    • Options
    • A. internal vibrator
    • B. screed vibrator
    • C. form vibrator
    • D. none of these.
    • Discuss
    • 6. The final operation of finishing floors, is known as

    • Options
    • A. screeding
    • B. floating
    • C. trowelling
    • D. finishing
    • E. all the above.
    • Discuss
    • 7. The produce impermeable concrete

    • Options
    • A. thorough mixing of concrete is required
    • B. proper compaction of concrete is required
    • C. proper curing of concrete is required
    • D. properly graded and non-porous aggregates are requied
    • E. all the above.
    • Discuss
    • 8. According to the recommendations of IS : 456-1978, the expansion joints

    • Options
    • A. are provided where plane changes abruptly
    • B. are provided to ensure minimum resistance
    • C. are supported on separate columns
    • D. do not carry reinforcement across them
    • E. all the above.
    • Discuss
    • 9. The datum temperature for maturity by Plowman, is

    • Options
    • A. 23°C
    • B. 0°
    • C. - 5.6°C
    • D. - 11.7°C
    • Discuss
    • 10. For an ordinary Portland cement

    • Options
    • A. residual does not exceed 10% when sieved through IS Sieve No. 9
    • B. soundness varies from 5 to 10 mm
    • C. initial setting time is not less than 30 minutes
    • D. compressive stress after 7 days, is not less than 175 kg/cm2
    • E. all the above.
    • Discuss


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